To answer this, we must go back and ask, why to atoms form molecules? The answer is, they all wish they were noble gases! Noble gases have their outer, or valence, electron shells completely full, which makes them so perfect, they don't need to interact with anything.
Mr. Guch's Cavalcade o' Teaching - basic procedures, atomic structure, periodic tables, etc.
about.com - more balancing equations practice sheets
Doc Brown's Chemistry A LEVEL QUIZZES and WORKSHEETS Interactive quizes
Organic Chemistry course includeing worksheets and answer keys
Honors Chemistry a complete course with lecture notes, worksheets and quizes
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